My '89 300TE was running rough at idle, just not the same old smooth self. Having been told by an independent Merc. shop that Techron works on cleaning injectors I though I would try a bottle with 3/4 tank of gas. It made all the difference, the old smooth idle is back and that's all I did. Food for thought.

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....just drive'em!
'89 300TE White w/Blue, 152K SOLD!
'93 300E Blue w/Tan, 154K SOLD!
'01 E-320 4-Matic wagon, 130K
'67 Vette Conv. White w/Blue, 217,421K